Loss of pictures on memory card but still memory used...

Using along with a Olympus xD M256mb picture card.... all my photos dissapeared, my camera tells me that my card is empty yet theres 130MB been used.... Ive also tryed going through Windows to find the pics.... Id previously formated the card after the same problem occured.. so unlike previous advice on this forum my problem hasnt been after hundreds of shots rather about 30.
thanks

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Sounds like you will need to format the memory card. This will permanently erase all the data from the card and then you will be able to use it again. To format the card: Press the Ok button - right arrow to Mode Menu - down arrow to Card tab - right arrow to card setup - right arrow to format option. You will see format yes or no. Choose Yes and press ok. This will clear the card full message and the card can be used again.

You can add memory to your camera by purchasing an xd memory card.
Compatible cards
xD-Picture Card (16MB – 1GB)
There are two ways to record the pictures you take with this camera.
Recording pictures to the internal memory
• Pictures are recorded to the internal memory, and when the number of storable still
pictures reaches 0, you must connect the camera to a computer to download the
pictures, and then erase the pictures from the internal memory.
Using an xD-Picture Card (optional)
• Pictures are recorded to the card when inserted in the camera. When the card is
full, you download the pictures to a computer, and then either erase the pictures
from the card or use a new card.
• Pictures are not recorded to the internal memory when a card is inserted in the
camera. Pictures in the internal memory can be copied to the card using the
[BACKUP] function.
g“BACKUP Copying pictures in the internal memory to the card” (P.25)
“The card” (P.60)
Number of storable still pictures and recording length of movies
Still pictures
Movie
• If you use a non-Olympus card or a card used for another application, such as for
a computer, the message [CARD ERROR] is displayed. To use this card with this
camera, use the [FORMAT] function to format the card.
g“MEMORY FORMAT (FORMAT) Formatting the internal memory/card” (P.24)
Additional shooting tips and information
Increasing the number of pictures that can be taken
IMAGE QUALITY Image size
Number of storable still pictures
Internal memory Card (128 MB)
SHQ 2816 × 2112 2 25
HQ 2816 × 2112 6 76
SQ1 2048 × 1536 8 108
SQ2 640 × 480 60 726
IMAGE QUALITY Image size
Remaining recording time
Internal memory Card (128 MB)
HQ 320 × 240 (15 frames/sec.) 32 sec. 6 min. 37 sec.
SQ 160 × 120 (15 frames/sec.) 2 min. 8 sec. 26 min. 28 sec.

If I remember my last Olympus camera it would only work in Panorama mode with an official Olympus memory card. No third party cards would enable that feature. My instructions read "An Olympus xD-Picture Card is
required for panorama shooting." If you are using an official Olympus xD-Picture card, there may be a problem with your camera.

The internal memory and the xD-Picture Card cannot be used at the same time. When the card is inserted the internal memory is disabled. When you want to use the internal memory, remove the xD Picture Card. The LCD display will indicate that images are saved to internal memory by displaying [IN] in the lower right corner of the screen. When using the xD-Picture Card the camera’s LCD will display [xD] in the lower right corner of the screen. These indicators are displayed just above the number of available frames.

The internal memory and xD-Picture Card cannot be used at the same time. When the card is inserted the internal memory is disabled. When you want to use the internal memory you must remove the xD-Picture card. The LCD display indicates the images are being saved to the internal memory by displaying [IN] in the lower right corner of the screen. When using the xD-Picture Card the LCD will display [xD] in the lower right corner. These indicators are displayed just above the number of available frames.